参数资料
型号: MIC5259-2.85YML TR
厂商: Micrel Inc
文件页数: 9/11页
文件大小: 0K
描述: IC REG LDO 2.85V .3A 6-MLF
标准包装: 1
稳压器拓扑结构: 正,固定式
输出电压: 2.85V
输入电压: 最高 6V
电压 - 压降(标准): 0.3V @ 300mA
稳压器数量: 1
电流 - 输出: 300mA
电流 - 限制(最小): 350mA
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 6-VQFN 裸露焊盘,6-MLF?
供应商设备封装: 6-MLF?(2x2)
包装: 剪切带 (CT)
产品目录页面: 1100 (CN2011-ZH PDF)
其它名称: 576-2832-1
P D(max) = ?
? 125 ° C ? 70 ° C ?
Micrel, Inc.
The actual power dissipation of the regulator circuit can
be determined using the equation:
P D = (V IN – V OUT ) I OUT + V IN I GND
Substituting P D(max) for P D and solving for the operating
conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit.
For example, when operating the MIC5259-2.8BML at
70°C with a minimum footprint layout, the maximum
input voltage for a set output current can be determined
as follows:
?
? 90 ° C/W ?
P D(max) = 611mW
MIC5259
The junction-to-ambient thermal resistance for the
minimum footprint is 90°C/W, from Table 1. The
maximum power dissipation must not be exceeded for
proper operation. Using the output voltage of 2.8V and
an output current of 200mA, the maximum input voltage
can be determined. Because this device is CMOS and
the ground current is typically 110μA over the load
range, the power dissipation contributed by the ground
current is < 1% and can be ignored for this calculation.
611mW = (V IN – 2.8V) 200mA
611mW = V IN × 200mA – 560mW
1171mW = V IN × 200mA
V IN(max) = 5.85V
Therefore, a 2.8V application at 200mA of output current
can accept a maximum input voltage of 5.85V in an MLF
package. For a full discussion of heat sinking and
thermal effects on voltage regulators, refer to the
“Regulator Thermals” section of Micrel’s Designing with
Low-Dropout Voltage Regulators handbook.
September 2006
9
M9999-091406
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